Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b9208eb5234257…

MALICIOUS

PDF

41.7 KB Created: 2020-08-12 04:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2999644f0cf070d4fd790844a48970e9 SHA-1: ede7412b826221ca2bf8ee77a65898faa5b3721e SHA-256: b6b9208eb5234257218836083adef84125dd4350ba1bb0ae2033d206f4b9d923
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a document about lymph nodes anatomy. The PDF also features a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs points towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=lymph+nodes+anatomy+pdf
    • http://ladaxuned.marleemoo.com/uploads/1/3/1/4/131453832/234507b7623.pdf
    • http://files.mounthebronstem.com/uploads/1/3/1/4/131482930/vonuf.pdf
    • http://files.lionsdiabetesawareness.org/uploads/1/3/0/7/130739398/gibozomupeti_dewudon.pdf
    • http://files.epicfitcouple.com/uploads/1/3/0/8/130813448/41c57b85.pdf
    • http://files.grunthalminorhockey.com/uploads/1/3/2/6/132680901/xegenag.pdf
    • https://cdn.shopify.com/s/files/1/0433/2417/8600/files/neural_networks_for_statistical_modeling.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4839/files/81784480765.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64541570927.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/vitijupisepagozewid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7207/files/alinta_energy_price_fact_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2022/2627/files/43539888207.pdf
    • https://cdn.shopify.com/s/files/1/0437/1405/2247/files/apply_magic_sauce.pdf
    • https://cdn.shopify.com/s/files/1/0428/6503/3383/files/nobeponovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8354/files/aseptic_packaging_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/54803368766.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2309/files/texedixeses.pdf
    • https://cdn.shopify.com/s/files/1/0431/1577/4108/files/37829504248.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/curl_with_headers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066c1.bin
b6c75d18811bc2d99fa5b41766371733fb85a700e1d382fe378f0b3a661a67e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C1 5196 bytes
font_01_sfnt_off0000785b.bin
9dcd329bb428e6649c1880acbee7d63f0806c8479561218e124cd1b6fd527487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785B 9644 bytes

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